The LIRR has budgeted $70 million this year to maintain its track infrastructure, including the renewal of two grade crossings Saturday and the inspection of all commuter track between Babylon and Montauk from Monday through Thursday.

Buses will run between Speonk and Sayville for about 24 hours on Saturday beginning at 12:43 a.m. so crews can replace grade crossings at West Avenue in Patchogue and Mastic Road in Mastic.

Train service is expected to resume early Sunday with the departure of the 12:38 a.m. train from Penn Station.

Inspections using the Sperry Rail Car means buses will be deployed along segments of the Montauk branch on Tuesday, Wednesday and Thursday mornings.

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Passengers at Patchogue and Bellport will board a bus up to 28 minutes earlier for Speonk, where train service will resume, the service said. Those traveling from Westhampton to Montauk will board an earlier train to Sayville for bus service to Speonk. Customers should allow for up to 49 minutes of extra travel time.

Westbound customers traveling from Speonk through Patchogue should board busses up to 31 minutes earlier than normal for Sayville, where train service will be available for those traveling farther west.

Passengers traveling between Montauk and stations west of Speonk will board buses at Speonk to stations Mastic-Shirley through Patchogue.

Passengers traveling between Montauk and stations west of Patchogue will board buses at Speonk to Sayville, where train service will resume. Allow for up to 48 minutes of extra travel time, the service said.

Between Monday and Thursday, the service conducts its semiannual inspection of track conditions using the specially-equipped Sperry Rail Car.

The inspection car will operate between Babylon and Patchogue on Monday; Patchogue to Montauk on Tuesday; Speonk to Montauk on Wednesday; and Babylon to Patchogue again to inspect a separate section of track on Thursday.

Riders should plan for 20 minutes to 75 minutes of extra travel time, the LIRR said.

More information on LIRR service is at mta.info or by monitoring LIRR service alerts via email or text message. Customers also can call 511, the New York State Travel Information line, and say: Long Island Rail Road.